CVE-2026-52783 Information disclosure in openproject
Attackers with cache access can retrieve plaintext OAuth tokens from OpenProject, enabling unauthorized access to integrated storage services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-52783?
CVE-2026-52783 is a high-severity vulnerability in opf openproject, published on 26 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, OpenProject's Storages module writes the OneDrive/SharePoint userless OAuth access_token plaintext to Rails.cache under the deterministic key storage.<id>.httpx_access_token, repopulated continuously by an hourly cron and every userless-OAuth call site (see Write cadence). None of the three allowed cache backends (file_store, memcache, redis) encrypts at rest. An attacker with read access to the cache backend recovers the Azure-AD application-tier bearer with an anonymous get over the memcached binary protocol (or the equivalent against Redis). This vulnerability is fixed in 17.3.3 and 17.4.1.
Weakness: CWE-313
Which versions are affected by CVE-2026-52783?
How do I fix CVE-2026-52783?
No fix has been published for CVE-2026-52783 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-52783 being exploited?
There is no known exploitation of CVE-2026-52783 in the wild and no public exploit code.
Sources
Also known as GHSA-h83w-5q5x-pq27.